On Mon, 2018-08-06 at 16:20 -0700, Randy Dunlap wrote: +AD4- Fixes: 3703b2c5d041 (+ACIAWw-SCSI+AF0- tcm+AF8-loop: Add multi-fabric Linux/SCSI LLD +AD4- fabric module+ACI-) >From drivers/target/Kconfig on Linus' master branch: menuconfig TARGET+AF8-CORE tristate +ACI-Generic Target Core Mod (TCM) and ConfigFS Infrastructure+ACI- depends on SCSI +ACYAJg- BLOCK if TARGET+AF8-CORE +AFs- ... +AF0- source +ACI-drivers/target/loopback/Kconfig+ACI- endif In other words, the loopback driver already depends on SCSI. So I doubt that this is a longstanding issue. Did you encounter this with Linus' master branch or rather with linux-next? Thanks, Bart.